An object made from brass was left out in the sun for 17 hours had an initial temperature of 20 Degrees Celsius , later that day it's temperature was recorded to be 45 Degrees . The brass object had an initial length 18m . Calculate the change in objects length . Knowing that M a=19*10^ ^ -19

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.